Turn dough out onto a lightly floured surface, and knead until a ball forms, 3 to 5 minutes. Place in a buttered bowl, cover with plastic wrap, and let rise in a warm, draft-free spot until doubled in bulk, about 1 hour.

Preheat oven to 375 degrees. Bake cakes in upper third of oven, rotating halfway through, until a tester inserted in the centers of the cakes comes out clean (bottom crusts will be golden brown), 30 to 35 minutes. Let cool completely in pans on wire racks. Cut each cake into 15 squares, and serve.